<!DOCTYPE>
<html>
<head>
    <title>聊天室</title>
    <script src="./js/jquery-1.12.3.min.js"></script>
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css"/>
    <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <style>
        body {
            margin-top: 5px;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-md-3">
            <div class="panel panel-primary">
                <div class="panel-heading">
                    <h3 class="panel-title">当前登录用户</h3>
                </div>
                <div class="panel-body">
                    <div class="list-group">
                        <a href="#" class="list-group-item">你好，<span id="user"></span></a>
                        <a href="logout" class="list-group-item">退出</a>
                    </div>
                </div>
            </div>
            <div class="panel panel-primary" id="online">
                <div class="panel-heading">
                    <h3 class="panel-title">当前在线的其他用户</h3>
                </div>
                <div class="panel-body">
                    <div class="list-group" id="users">
                    </div>
                </div>
            </div>
            <div class="panel panel-primary">
                <div class="panel-heading">
                    <h3 class="panel-title">群发系统广播</h3>
                </div>
                <div class="panel-body">
                    <input type="text" class="form-control" id="msg"/><br>
                    <button id="broadcast" type="button" class="btn btn-primary">发送</button>
                </div>
            </div>
        </div>
        <div class="col-md-9">
            <div class="panel panel-primary">
                <div class="panel-heading">
                    <h3 class="panel-title" id="talktitle"></h3>
                </div>
                <div class="panel-body">
                    <div class="well" id="log-container" style="height:400px;overflow-y:scroll">

                    </div>
                    <input type="text" id="myinfo" class="form-control col-md-12"/> <br>
                    <button id="send" type="button" class="btn btn-primary">发送</button>
                </div>
            </div>
        </div>
    </div>
</div>
<script>


    Date.prototype.format = function (fmt) {
        var o = {
            "M+": this.getMonth() + 1,                 //月份
            "d+": this.getDate(),                    //日
            "h+": this.getHours(),                   //小时
            "m+": this.getMinutes(),                 //分
            "s+": this.getSeconds(),                 //秒
            "q+": Math.floor((this.getMonth() + 3) / 3), //季度
            "S": this.getMilliseconds()             //毫秒
        };
        if (/(y+)/.test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
        }
        for (var k in o) {
            if (new RegExp("(" + k + ")").test(fmt)) {
                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
            }
        }
        return fmt;
    }


    //获取浏览器缓存
    function getCookie(c_name) {
        if (document.cookie.length > 0) {
            c_start = document.cookie.indexOf(c_name + "=")
            if (c_start != -1) {
                c_start = c_start + c_name.length + 1
                c_end = document.cookie.indexOf(";", c_start)
                if (c_end == -1) c_end = document.cookie.length
                return unescape(document.cookie.substring(c_start, c_end))
            }
        }
        return ""
    }

    $(document).ready(function () {
        var cookie = getCookie("Authorization");
        console.log(cookie);
        var user;
        var uid;
        // 指定websocket路径
        var websocket;
        $.get("/currentuser", function (data) {
            user = data.name;
            uid = data.uid;
            $("#user").html(user);

            if ('WebSocket' in window) {
                websocket = new WebSocket("ws://localhost:8080/webSocket/" + user);
            }
            websocket.onmessage = function (event) {
                var data = JSON.parse(event.data);
                if (data.to == 0) {//上线消息
                    if (data.text != user) {
                        $("#users").append('<a href="#" onclick="talk(this)" class="list-group-item">' + data.text + '</a>');
                        alert(data.text + "上线了");
                    }
                } else if (data.to == -2) {//下线消息
                    if (data.text != user) {
                        $("#users > a").remove(":contains('" + data.text + "')");
                        alert(data.text + "下线了");
                    }
                } else {
                    // 普通消息
                    // 接收服务端的实时消息并添加到HTML页面中
                    $("#log-container").append("<div class='bg-info'><label class='text-danger'>" + data.from + "&nbsp;" + data.date + "</label><div class='text-success'>" + data.text + "</div></div><br>");
                    // 滚动条滚动到最低部
                    scrollToBottom();
                }
            };

            $.post("/onlineusers?currentuser=" + user, function (data) {
                for (var i = 0; i < data.length; i++)
                    $("#users").append('<a href="#" onclick="talk(this)" class="list-group-item">' + data[i] + '</a>');
            });

        });


        $("#broadcast").click(function () {
            var data = {};
            data["from"] = "系统消息";
            data["to"] = -1;
            data["text"] = $("#msg").val();
            websocket.send(JSON.stringify(data));
        });

        $("#send").click(function () {
            if ($("body").data("to") == undefined) {
                alert("请选择聊天对象");
                return false;
            }
            var data = {};
            data["from"] = user;
            data["to"] = $("body").data("to");
            data["text"] = $("#myinfo").val();
            websocket.send(JSON.stringify(data));
            $("#log-container").append("<div class='bg-success'><label class='text-info'>我&nbsp;" + new Date().format("yyyy-MM-dd hh:mm:ss") + "</label><div class='text-info'>" + $("#myinfo").val() + "</div></div><br>");
            scrollToBottom();
            $("#myinfo").val("");
        });

    });

    function talk(a) {
        $("#talktitle").text("与" + a.innerHTML + "的聊天");
        $("body").data("to", a.innerHTML);
    }

    function scrollToBottom() {
        var div = document.getElementById('log-container');
        div.scrollTop = div.scrollHeight;
    }
</script>

</body>
</html>
